Cooper's Hawk
"Among the bird world’s most skillful fliers, Cooper’s Hawks are common woodland hawks that tear through cluttered tree canopies in high speed pursuit of other birds. You’re most likely to see one prowling above a forest edge or field using just a few stiff wingbeats followed by a glide.
Size & Shape - A medium-sized hawk with the classic accipiter shape: broad, rounded wings and a very long tail. In Cooper’s Hawks, the head often appears large, the shoulders broad, and the tail rounded.
Color Pattern - Adults are steely blue-gray above with warm reddish bars on the underparts and thick dark bands on the tail. Juveniles are brown above and crisply streaked with brown on the upper breast, giving them a somewhat hooded look compared with young Sharp-shinned Hawks' more diffuse streaking.
Behavior - Look for Cooper’s Hawks to fly with a flap-flap-glide pattern typical of accipiters. Even when crossing large open areas they rarely flap continuously. Another attack maneuver is to fly fast and low to the ground, then up and over an obstruction to surprise prey on the other side.
Habitat - Wooded habitats from deep forests to leafy subdivisions and backyards."
Source:
http://www.allaboutbirds.org/guide/Coopers_Hawk/idLocation: Kendall Ridge, Columbia, MD